RedGreen:
The B suffix was used for the '57-'62 passenger car 235 with powerglide. The 0528 is the build date, which translates to May 28. As I mentioned above, this serial number format does not give the year, but I can tell you it is a '60 or later, since the month is given as two digits (05) instead of one digit (5), which was a format change made in '60. You could pinpoint the year by looking for the block casting date code (a letter followed by 2 or 3 numbers) cast in the block probably by the starter. The last number in this code is the last number of the year.
Incidentally, the B suffix was also used in '63 and '64 for the passenger car 230 with powerglide.
